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European Physical Journal A 44 (2010) 363-372
Precise half-life measurements for 38Ca and 39Ca
B. Blank1, A. Bey, I. Matea, J. Souin1, L. Audirac1, M.J.G. Borge2, G. Canchel1, P. Delahaye3, F. Delalee1, C.-E. Demonchy1, R. Domínguez-Reyes2, L.M. Fraile, J. Giovinazzo1, Tran Trong Hui, J. Huikari, D. Lunney4, F. Munoz1, J.-L. Pedroza1, C. Plaisir1, L. Serani1, S. Sturm, O. Tengblad2, F. Wenander3

The half-lives of 38Ca and 39Ca have been measured at ISOLDE of CERN. The REXTRAP facility was used to prepare ultra-clean samples of radioactive nuclei for precision decay spectroscopy. 38Ca is one of the T z = - 1 , 0+ 0+ -emitting nuclides used to determine the vector coupling constant of the weak interaction and the Vud quark-mixing matrix element. The result obtained, T 1/2 = 443.8(19) ms, is four times more precise than the average of previous measurements. For 39Ca , a half-life of T 1/2 = 860.7(10) ms is obtained, a result in agreement with the average value from the literature.
1 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
2 :  IEM - Instituto de Estructura de la Materia
3 :  CERN - European Organization for Nuclear Research
4 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Physique Nucléaire Expérimentale